Gas pipeline protection device

Abstract

The present application provides a gas transmission pipeline protection device, belonging to the technical field of gas transmission pipelines. The gas transmission pipeline protection device includes a first safety shut-off valve, a first pressure gauge, and an emergency shutdown system ESD; the first safety shut-off valve and the first pressure gauge are both installed in the upstream part of the gas transmission pipeline, and the first safety shut-off valve and the first pressure gauge are respectively connected to the ESD; the first safety shut-off valve is used to cut off the gas transported by the gas transmission pipeline under the condition that the pressure of the flowing gas is greater than the first pressure threshold; the first pressure gauge is used to upload the measured gas pressure to the ESD; the ESD is used to send a first control signal to the first safety shut-off valve under the condition that the pressure measured by the first pressure gauge is greater than the second pressure threshold; the first safety shut-off valve is further used to cut off the gas transported by the gas transmission pipeline in response to the first control signal. The present application ensures the safe operation of the downstream part of the gas transmission pipeline through double protection of the downstream part of the gas transmission pipeline.

Description

Technical Field

[0001] This application relates to the technical field of gas transmission pipelines, and particularly to a gas transmission pipeline protection device. Background Art

[0002] If the natural environment where a certain section of the gas transmission pipeline trunk line is located is harsh and a compressor station can only be set at the starting position of this section of the gas transmission pipeline trunk line, then in this section of the gas transmission pipeline trunk line, the pressure of the gas will gradually decrease as it is transported downstream. To reduce the cost of pipeline construction, the maximum bearing pressure of the downstream part with a relatively low pressure in this section of the gas transmission pipeline trunk line can be appropriately reduced.

[0003] When an accident occurs in the gas transmission pipeline, the pressure of the gas transported in the downstream part of the gas transmission pipeline will exceed the maximum bearing pressure of this downstream part, resulting in accidents such as pipeline rupture and gas leakage. Therefore, there is an urgent need for a gas transmission pipeline protection device to ensure the safe operation of the downstream part of the gas transmission pipeline. Summary of the Invention

[0004] The embodiment of this application provides a gas transmission pipeline protection device, which can provide safety protection for the downstream part of a gas transmission pipeline with a variable pressure design. The gas transmission pipeline protection device is applied to a gas transmission pipeline, the maximum bearing pressure of the upstream part of the gas transmission pipeline is greater than that of the downstream part of the gas transmission pipeline, the upstream part and the downstream part are divided by a variable pressure point, and the gas in the gas transmission pipeline is transported from the upstream part to the downstream part;

[0005] The gas transmission pipeline protection device includes a first safety shut-off valve, a first pressure gauge, and an emergency shutdown system ESD;

[0006] Both the first safety shut-off valve and the first pressure gauge are installed in the upstream part of the gas transmission pipeline. The installation position of the first pressure gauge is between the first safety shut-off valve and the variable pressure point, and the first safety shut-off valve and the first pressure gauge are respectively connected to the ESD;

[0007] The first safety shut-off valve is used to cut off the gas transported by the gas transmission pipeline under the condition that the pressure of the gas flowing through the first safety shut-off valve is greater than a first pressure threshold, and the first pressure threshold is less than the maximum bearing pressure of the downstream part;

[0008] The first pressure gauge is used to upload the measured gas pressure to the ESD;

[0009] The ESD is used to send a first control signal to the first safety shut-off valve under the condition that the pressure measured by the first pressure gauge is greater than a second pressure threshold. The second pressure threshold is less than the maximum bearing pressure of the downstream part and greater than the first pressure threshold;

[0010] The first safety shut-off valve is further configured to cut off the gas transported through the gas pipeline in response to the first control signal.

[0011] In a possible implementation, the gas pipeline protection device further includes an ESD control valve;

[0012] The ESD control valve is installed in the upstream portion of the gas pipeline, and the installation position of the ESD control valve is between the installation position of the first safety shut-off valve and the variable pressure point;

[0013] The ESD control valve is connected to the ESD;

[0014] The ESD is further configured to send a second control signal to the ESD control valve under the condition that the pressure measured by the first pressure gauge is greater than a second pressure threshold;

[0015] The ESD control valve is configured to cut off the gas transported through the gas pipeline in response to the second control signal.

[0016] In another possible implementation, the distance between the installation position of the ESD control valve and the variable pressure point is less than a first distance threshold.

[0017] In another possible implementation, the first safety shut-off valve is further configured to send a first cut-off signal to the ESD under the condition that the pressure of the gas flowing through the first safety shut-off valve is greater than a first pressure threshold;

[0018] The ESD is further configured to send a second control signal to the ESD control valve in response to the first cut-off signal.

[0019] In another possible implementation, the gas pipeline protection device further includes a second safety shut-off valve;

[0020] The second safety shut-off valve is installed in the upstream portion of the gas pipeline, and the installation position of the second safety shut-off valve is between the installation position of the first safety shut-off valve and the installation position of the ESD control valve;

[0021] The second safety shut-off valve is configured to cut off the gas transported through the gas pipeline under the condition that the pressure of the gas flowing through the second safety shut-off valve is greater than a third pressure threshold, and the third pressure threshold is less than the maximum bearing pressure of the downstream portion.

[0022] In another possible implementation, the third pressure threshold is less than the first pressure threshold.

[0023] In another possible implementation, the second safety shut-off valve is connected to the ESD;

[0024] The second safety shut-off valve is further configured to send a second shut-off signal to the ESD when the pressure of the gas flowing through the second safety shut-off valve is greater than a third pressure threshold;

[0025] The ESD is further configured to send a second control signal to the ESD control valve when receiving the second shut-off signal.

[0026] In another possible implementation, the gas pipeline protection device further includes a third safety shut-off valve;

[0027] The third safety shut-off valve is installed in the upstream portion of the gas pipeline, and the installation position of the third safety shut-off valve is between the installation position of the first safety shut-off valve and the pressure change point;

[0028] The third safety shut-off valve is configured to cut off the gas transported by the gas pipeline when the pressure of the gas flowing through the third safety shut-off valve is greater than a fourth pressure threshold, and the fourth pressure threshold is less than the maximum bearing pressure of the downstream portion.

[0029] In another possible implementation, the third safety shut-off valve is connected to the ESD;

[0030] The ESD is further configured to send a third control signal to the third safety shut-off valve when the pressure measured by the first pressure gauge is greater than a second pressure threshold;

[0031] The third safety shut-off valve is further configured to cut off the gas transported by the gas pipeline in response to the third control signal.

[0032] In another possible implementation, the distance between the installation position of the first safety shut-off valve and the pressure change point is less than a second distance threshold.

[0033] The present application provides a gas transmission pipeline protection device, which is applied to a gas transmission pipeline with variable pressure design. On the one hand, when the gas pressure flowing through the safety shut-off valve upstream of the variable pressure point approaches the maximum bearing pressure of the downstream part, the safety shut-off valve will cut off the transported gas, so that the gas with a higher pressure will no longer be transported to the downstream with a lower maximum bearing pressure. On the other hand, the ESD obtains the gas pressure closer to the downstream part measured by the first pressure gauge. When the gas pressure closer to the downstream part approaches the maximum bearing pressure of the downstream part, it timely controls the safety shut-off valve upstream to cut off the transported gas, so that the gas pressure of the downstream part of the gas transmission pipeline no longer continues to rise. Thus, the gas transmission pipeline protection device realizes double protection for the downstream part of the gas transmission pipeline by not transporting gas with a higher pressure to the downstream with a lower maximum bearing pressure and cutting off the gas transportation of the upstream part based on the gas pressure feedback by the first pressure gauge, preventing the downstream part of the gas transmission pipeline from bursting due to gas overpressure, ensuring the safe operation of the downstream part of the gas transmission pipeline, and improving the safety of the downstream part of the gas transmission pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 It is a schematic diagram of a gas transmission pipeline protection device provided by an embodiment of the present application.

[0036] Figure 2 It is a block diagram of a computer device provided by an embodiment of the present application.

[0037] In the figure, 101 represents the first safety shut-off valve; 102 represents the first pressure gauge; 103 represents the variable pressure point; 104 represents the ESD control valve; 105 represents the second safety shut-off valve; 106 represents the first local pressure gauge; 107 represents the second local pressure gauge; 108 represents the first gas collecting pipe; 109 represents the second gas collecting pipe; 110 represents the second pressure gauge; 111 represents the first electric valve; 112 represents the second electric valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the drawings.

[0039] The terms "first", "second", "third", "fourth", etc. in the description, claims, and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0040] The maximum allowable operating pressure of a gas transmission pipeline refers to the maximum pressure that the pipeline can withstand during safe operation. It is determined by comprehensively considering factors such as pipeline material, pipe manufacturing level, construction quality, downstream users' pressure requirements, and safety in the areas through which the pipeline passes during the pipeline design process. Currently, to improve the gas transmission capacity of pipelines, long-distance pipeline trunk lines generally use high-pressure transmission to transport gas. Since the loss generated during gas transmission will cause the gas pressure to continuously decrease, pressure stations are set up in the middle of the gas transmission pipeline to boost the pressure of the gas being transported, so as to maintain high-pressure gas transmission. Correspondingly, to ensure the safe transmission of gas, the different parts of the gas transmission pipeline all maintain the same relatively high maximum allowable operating pressure.

[0041] The greater the maximum allowable operating pressure of a gas transmission pipeline, the higher the requirements for aspects such as pipeline material, pipe manufacturing level, and construction quality, and the higher the construction cost of the pipeline. If the natural conditions along the gas transmission pipeline are relatively harsh and there are no conditions for building compressor stations in the middle of the gas transmission pipeline, the gas pressure will gradually decrease as the transmission distance continuously increases. Or, if a certain section of the gas transmission pipeline is relatively long and there is no compressor station in the middle, the gas pressure will also gradually decrease as the transmission distance continuously increases, resulting in a relatively large difference in gas pressure between the front section and the rear section of the gas transmission pipeline. Therefore, to reduce the pipeline construction cost, during pipeline design, the maximum allowable operating pressure of the gas transmission pipeline can be reduced at appropriate positions. For example, the pressure of the gas at point a is 12 MPa (megapascals) and gradually decreases as the transmission distance continuously increases and drops below 10 MPa at point b. After the gas reaches point b, it will continue to be transported. To reduce the pipeline construction cost, the maximum allowable operating pressure of the gas transmission pipeline from point a to point b can be 12 MPa, and the maximum allowable operating pressure of the gas transmission pipeline after point b can be 10 MPa.

[0042] The above process can also be called the variable pressure design of the gas transmission pipeline. For the gas transmission pipeline with variable pressure design, the gas in the pipeline is transported from the upstream part to the downstream part. The upstream part and the downstream part are separated by a variable pressure point. The maximum allowable pressure of the upstream part of the gas transmission pipeline is greater than that of the downstream part. When constructing a gas transmission pipeline using the variable pressure design method, the safety protection of the downstream part of the gas transmission pipeline should also be considered to prevent the pressure of the gas flowing through the downstream part of the pipeline from exceeding the maximum allowable pressure of the downstream part. Based on this, the present application provides a gas transmission pipeline protection device to ensure the safe operation of the downstream part of the gas transmission pipeline.

[0043] Figure 1 It is a schematic diagram of a gas transmission pipeline protection device provided by an embodiment of the present application. Refer to Figure 1 , this gas transmission pipeline protection device is applied to a gas transmission pipeline. The gas transmission pipeline protection device includes a first safety shut-off valve 101, a first pressure gauge 102, and an ESD (Emergency Shutdown Device).

[0044] Among them, both the first safety shut-off valve 101 and the first pressure gauge 102 are installed in the upstream part of the gas transmission pipeline. The installation position of the first pressure gauge 102 is between the first safety shut-off valve 101 and the variable pressure point 103. The first safety shut-off valve 101 and the first pressure gauge 102 are respectively connected to the ESD. Optionally, the first safety shut-off valve 101 is connected to the ESD through a wired or wireless network, and the first pressure gauge 102 is connected to the ESD through a wired or wireless network. The present application does not limit this. In the embodiment of the present application, an example is given where the initial state of the first safety shut-off valve 101 is an open state, allowing gas to be transported downstream.

[0045] It should be noted that the maximum allowable pressure refers to the maximum pressure that a section of gas transmission pipeline can withstand. If the pressure of the gas flowing through a section of gas transmission pipeline is greater than the maximum allowable pressure of this section of pipeline, this section of pipeline may rupture due to overpressure, resulting in gas leakage and accidents. The variable pressure point 103 is the point where the maximum allowable pressure of the gas transmission pipeline changes. The maximum allowable pressure of the pipeline upstream of the variable pressure point 103 is greater than that of the pipeline downstream of the variable pressure point 103. Optionally, the location of the variable pressure point 103 is determined before pipeline construction. The computer device inputs at least one of the parameters such as the designed pipeline outer diameter, pipeline wall thickness, pipeline material, and heat transfer coefficient into the simulation analysis model. Through the simulation analysis model, the pressure of the gas transported to each location is simulated and analyzed to obtain the gas pressure at each location corresponding to the parameters input into the simulation analysis model. The location where the difference between the gas pressure and the gas pressure at the starting location is the reference value is determined as the location of the variable pressure point 103. For example, if the gas pressure at the starting location of the designed gas transmission pipeline is 12 MPa and the reference value is 2 MPa, then the location where the gas pressure is 10 MPa is determined as the location of the variable pressure point 103.

[0046] It should be noted that another point is that the first safety shut-off valve 101 is a self-acting safety shut-off valve and can operate automatically according to the pressure of the gas flowing through the first safety shut-off valve 101. When the pressure of the gas flowing through the first safety shut-off valve 101 is greater than the first pressure threshold, the first safety shut-off valve 101 quickly closes the valve to cut off the gas transported by the gas transmission pipeline, so that the gas no longer continues to be transported downstream. That is, the first safety shut-off valve 101 is used to cut off the gas transported by the gas transmission pipeline when the pressure of the gas flowing through the first safety shut-off valve 101 is greater than the first pressure threshold. In addition, when the gas flowing through the first safety shut-off valve 101 is less than or equal to the first pressure threshold, the first safety shut-off valve 101 keeps the valve open and allows the gas to continue to be transported downstream.

[0047] Among them, the first pressure threshold is less than the maximum allowable pressure of the downstream part of the gas transmission pipeline. The first pressure threshold can be flexibly configured according to the maximum allowable pressure of the downstream part of the gas transmission pipeline. Optionally, the first pressure threshold is configured as a value slightly less than the maximum allowable pressure of the downstream part. For example, if the maximum allowable pressure of the downstream part is 10 MPa, the first pressure threshold can be configured as any value slightly less than 10 MPa, such as 9.6 MPa, 9.7 MPa, or 9.8 MPa.

[0048] Optionally, since the first safety shut-off valve 101 is a shut-off valve provided to protect the safe operation of the downstream part of the gas transmission pipeline, the installation position of the first safety shut-off valve 101 should be upstream of the variable pressure and near the variable pressure point 103. Therefore, by making the distance between the installation position of the first safety shut-off valve 101 and the variable pressure point 103 less than the second distance threshold, the first safety shut-off valve 101 can cut off the gas about to be transported to the downstream part, so that the first safety shut-off valve 101 can avoid ineffective shut-off and effectively protect the downstream part of the gas transmission pipeline, prevent the downstream part of the gas transmission pipeline from bursting due to overpressure, and improve the safety of the downstream part of the gas transmission pipeline. Among them, the second distance threshold can be flexibly configured. For example, the second distance threshold can be configured as 5 meters or 3 meters, etc., and the present application does not limit this.

[0049] Another point to note is that ESD is a control system used to ensure the safe operation of the gas transmission pipeline. ESD receives the data uploaded by the measuring instrument; if the received data indicates that the gas transmission pipeline is in an overpressure state, it controls the relevant shut-off valve to close the valve to cut off the gas transported by the gas transmission pipeline; if the received data indicates that the gas transmission pipeline is not in an overpressure state, it keeps the relevant shut-off valve in the open state and does not cut off the gas transported by the gas transmission pipeline. Among them, the above-mentioned measuring instrument and the above-mentioned shut-off valve are connected to the ESD through a wired or wireless network, and the present application does not limit the connection method between the measuring instrument and the shut-off valve and the ESD.

[0050] The first pressure gauge 102 is one of the measuring instruments connected to the ESD as described above. The first pressure gauge 102 is used to measure the pressure of the gas flowing through the installation position where the first pressure gauge 102 is located, and upload the measured gas pressure to the ESD; the ESD is used to send a first control signal to the first safety shut-off valve 101 when the pressure measured by the first pressure gauge 102 is greater than the second pressure threshold. Among them, the first control signal is used to control the first safety shut-off valve 101 to cut off the gas transported by the gas transmission pipeline. The first safety shut-off valve 101 can also respond to this first control signal and close the valve, thereby cutting off the gas transported by the gas transmission pipeline. That is to say, the first safety shut-off valve 101 is also used to cut off the gas transported by the gas transmission pipeline in response to the first control signal. In addition, if the signal sent by the ESD to the first safety shut-off valve 101 last time is the first control signal, then the ESD sends an opening signal to the first safety shut-off valve 101 when the pressure measured by the first pressure gauge 102 is less than or equal to the second pressure threshold. The opening signal is used to control the first safety shut-off valve 101 to open the valve and allow the gas in the gas transmission pipeline to continue to be transported downstream; if the signal sent by the ESD to the first safety shut-off valve 101 last time is the opening signal or the ESD has not sent a signal to the first safety shut-off valve 101 yet, then the ESD does not send a signal to the first safety shut-off valve 101 when the pressure measured by the first pressure gauge 102 is less than or equal to the second pressure threshold, so that the first safety shut-off valve 101 remains in the open state.

[0051] In some embodiments, if the first safety shut-off valve 101 has closed the valve and cut off the gas transported by the gas transmission pipeline when receiving the first control signal, the first safety shut-off valve 101 continues to remain closed in response to the first control signal. In some embodiments, after the first safety shut-off valve 101 cuts off the gas transported by the gas transmission pipeline when the pressure of the gas flowing through the first safety shut-off valve 101 is greater than the first pressure threshold, it also sends a cut-off signal to the ESD. The cut-off signal indicates that the first safety shut-off valve 101 has cut off the gas transported by the gas transmission pipeline; if the ESD has received this cut-off signal, the ESD does not send the first control signal to the first safety shut-off valve 101 when the pressure measured by the first pressure gauge 102 is greater than the second pressure threshold. In some embodiments, if the first safety shut-off valve 101 has responded to the first control signal and cut off the gas transported by the gas transmission pipeline, the first safety shut-off valve 101 continues to remain closed when the pressure of the gas flowing through the first safety shut-off valve 101 is greater than the first pressure threshold.

[0052] Optionally, the installation position of the first pressure gauge 102 is located upstream of the variable pressure point 103 and near the variable pressure point 103, for measuring the gas pressure to be delivered to the variable pressure point 103, that is, for measuring the gas pressure to be delivered to the downstream part. Optionally, by making the distance between the installation position of the first pressure gauge 102 and the variable pressure point 103 less than the third distance threshold, the first pressure gauge 102 measures the gas pressure to be delivered to the variable pressure point 103 and uploads it to the ESD. Thus, when the gas pressure uploaded by the first pressure gauge 102 is greater than the second pressure threshold, the ESD can timely control the first safety shut-off valve 101 to cut off the gas transported in the gas pipeline, preventing the overpressure gas from continuing to be transported to the downstream part of the gas pipeline, ensuring the safe operation of the downstream part of the gas pipeline, and improving the safety of the gas pipeline. Among them, the third distance threshold can be flexibly configured. For example, the third distance threshold is configured as 1 meter, 50 centimeters, or 30 centimeters, etc., and the present application does not limit this.

[0053] In addition, the second pressure threshold is less than the maximum bearing pressure of the downstream part of the gas pipeline. The second pressure threshold can be flexibly configured according to the maximum bearing pressure of the downstream part of the gas pipeline. Optionally, the second pressure threshold is configured as a value slightly less than the maximum bearing pressure of the downstream part. For example, if the maximum bearing pressure of the downstream part is 10 MPa, the second pressure threshold can be configured as any value slightly less than 10 MPa, such as 9.7 MPa, 9.8 MPa, or 9.9 MPa. In some embodiments, the second pressure threshold can also be configured as 10 MPa.

[0054] Optionally, the second pressure threshold is greater than the first pressure threshold. Since the second pressure threshold is the threshold for comparing with the real-time pressure of the gas transported in the downstream part of the gas pipeline, by setting the second pressure threshold to a larger value, it is possible to reduce the unnecessary cut-off of the first safety shut-off valve 101 when the pressure does not exceed the maximum bearing pressure of the downstream part on the basis of protecting the safe operation of the downstream part of the gas pipeline, and improve the accuracy of the cut-off control of the first safety shut-off valve 101.

[0055] Optionally, the ESD is also connected to an alarm module. The ESD is also used to send an alarm instruction to the alarm module under the condition that the pressure measured by the first pressure gauge 102 is greater than the fifth pressure threshold and less than the second pressure threshold; the alarm module receives the alarm instruction and issues a corresponding alarm message to prompt the relevant staff that the pressure of the downstream part of the gas pipeline reaches a certain threshold, assisting the staff to judge whether to close the relevant valves. Optionally, the alarm module is an acoustic alarm, an optical alarm, or an alarm that sends an alarm message to a specified terminal, and the present application does not limit this. Among them, the fifth pressure threshold is less than the second pressure threshold. For example, the second pressure threshold is 10 MPa and the fifth pressure threshold is 9.8 MPa.

[0056] The present application provides a gas pipeline protection device, which is applied to a gas pipeline with a variable pressure design. On the one hand, the safety shut-off valve located upstream of the variable pressure point 103 will cut off the transported gas when the pressure of the gas flowing through it approaches the maximum pressure of the downstream part, so that the gas with higher pressure is no longer transported to the downstream with lower maximum pressure. On the other hand, the ESD obtains the gas pressure closer to the downstream part measured by the first pressure gauge 102. When the gas pressure closer to the downstream part approaches the maximum pressure of the downstream part, the ESD promptly controls the upstream safety shut-off valve to cut off the transported gas, so that the gas pressure in the downstream part of the gas pipeline no longer continues to rise. Therefore, the gas pipeline protection device achieves double protection of the downstream part of the gas pipeline by not transporting the gas with higher pressure to the downstream with lower maximum pressure, and by cutting off the gas transportation of the upstream part based on the gas pressure feedback from the first pressure gauge 102, preventing the downstream part of the gas pipeline from rupturing due to gas overpressure, ensuring the safe operation of the downstream part of the gas pipeline, and improving the safety of the downstream part of the gas pipeline.

[0057] Moreover, since the safety shut-off valve can automatically cut off the transported gas when the pressure of the flowing gas approaches the maximum pressure of the downstream part, without the need for human control, it can reduce the workload of staff inspections and reduce the labor costs required to ensure the safe operation of the pipeline. It has important practical value, especially in areas with relatively harsh natural conditions, such as high altitude areas and cold areas.

[0058] In addition, since the gas pipeline protection device is used on a gas pipeline with a variable pressure design, the gas pressure transported by the gas pipeline will gradually decrease with natural loss. The gas pipeline protection device includes a shut-off valve to ensure the safe operation of the gas pipeline. The safe operation of the gas pipeline can be ensured without setting an additional working pressure regulating valve to adjust the gas pressure. This simplifies the construction process of the gas pipeline protection device, reduces the construction cost of the gas pipeline protection device, and also reduces the space resources occupied by the gas pipeline protection device.

[0059] In another possible implementation, the gas pipeline protection device includes a first safety shut-off valve 101, a first pressure gauge 102, an ESD and an ESD control valve 104. The ESD control valve 104 is connected to the ESD and is a shut-off valve controlled by the ESD. Optionally, the ESD control valve 104 is connected to the ESD via a wired or wireless network, which is not limited in this application. In the embodiment of the present application, the initial state of the ESD control valve 104 is an open state, allowing gas to be transported downstream as an example for illustration. The ESD is also used to send a second control signal to the ESD control valve 104 under the condition that the pressure measured by the first pressure gauge 102 is greater than a second pressure threshold. The second control signal is used to control the ESD control valve 104 to cut off the gas transported by the gas pipeline. The ESD control valve 104 closes the valve in response to the second control signal, thereby cutting off the gas transported by the gas pipeline. That is, the ESD control valve 104 is used to cut off the gas transported by the gas pipeline in response to the second control signal.

[0060] The ESD control valve 104 is installed in the upstream portion of the gas pipeline, between the installation position of the first safety shut-off valve 101 and the pressure change point 103. By locating the ESD control valve 104 in the upstream portion of the gas pipeline, the ESD control valve 104 can promptly shut off the gas when the pressure in the downstream portion of the gas pipeline is high, preventing gas from being transported to the downstream portion. Even if the first safety shut-off valve 101 fails, the downstream portion of the gas pipeline can be prevented from rupturing due to overpressure, further improving the safety of the downstream portion of the gas pipeline.

[0061] Optionally, the installation position of the ESD control valve 104 is upstream of the pressure change point 103 and located near the pressure change point 103. By making the distance between the installation position of the ESD control valve 104 and the pressure change point 103 less than a first distance threshold, the ESD shut-off valve can shut off the gas about to be delivered to the downstream portion. When the gas pressure in the downstream portion is high, the gas delivered to the downstream portion can be further reduced, reducing the magnitude of the gas pressure increase in the downstream portion, thereby ensuring that the downstream portion of the gas pipeline will not rupture due to overpressure as much as possible, further improving the safety of the downstream portion of the gas pipeline. The first distance threshold can be flexibly configured, for example, the first distance threshold can be configured to 60 cm, 50 cm or 30 cm, etc., which is not limited in this application. In some embodiments, the installation position of the ESD control valve 104 can also be located near the installation position of the first pressure gauge 102, for example, the distance between the installation position of the ESD control valve 104 and the installation position of the first pressure gauge 102 is 20 cm or 30 cm.

[0062] Optionally, when the pressure measured by the first pressure gauge 102 is greater than the second pressure threshold, the ESD simultaneously sends a first control signal to the first safety shut-off valve 101 and a second control signal to the ESD control valve 104 to control the first safety shut-off valve 101 and the ESD control valve 104 to simultaneously cut off the conveyed gas; alternatively, the ESD can also, when the pressure measured by the first pressure gauge 102 is greater than the second pressure threshold, first send the first control signal to the first safety shut-off valve 101 and then send the second control signal to the ESD control valve 104; or the ESD can also, when the pressure measured by the first pressure gauge 102 is greater than the second pressure threshold, first send the second control signal to the ESD control valve 104 and then send the first control signal to the first safety shut-off valve 101. The present application does not limit the sequence of sending control signals by the ESD to the first safety shut-off valve 101 and the ESD control valve 104. In some embodiments, the ESD can also, when the pressure measured by the first pressure gauge 102 is greater than the second pressure threshold, first send the second control signal to the ESD control valve 104. If the ESD control valve 104 fails to cut off the gas conveyed downstream, then send the first control signal to the first safety shut-off valve 101; if the ESD control valve 104 cuts off the gas conveyed downstream, then no longer send the first control signal to the first safety shut-off valve 101, thereby ensuring the safety of the downstream part of the gas transmission pipeline by controlling a small number of valves.

[0063] In addition, optionally, the first safety shut-off valve 101 is also interlocked with the ESD control valve 104 through the ESD. When the gas pressure upstream is greater than the first pressure threshold, the ESD control valve 104 is simultaneously controlled to cut off the gas conveyed downstream. Since the ESD control valve 104 is located downstream of the first safety shut-off valve 101, it is possible to further reduce the gas conveyed to the downstream part and reduce the amplitude of the increase in the gas pressure in the downstream part, preventing the downstream part of the gas transmission pipeline from bursting due to overpressure and further improving the safety of the downstream part of the gas transmission pipeline. To achieve the interlock between the first safety shut-off valve 101 and the ESD control valve 104, the first safety shut-off valve 101 is further configured to send a first cut-off signal to the ESD when the pressure of the gas flowing through the first safety shut-off valve 101 is greater than the first pressure threshold; the ESD is further configured to, in response to the first cut-off signal, send a second control signal to the ESD control valve 104; and then the ESD control valve 104, in response to the second control signal, cuts off the gas conveyed by the gas transmission pipeline.

[0064] It should be noted that, in some embodiments, if the ESD has already sent the second control signal to the ESD control valve 104 based on the pressure measured by the first pressure gauge 102 before receiving the first cutoff signal, the ESD will no longer send repeated second control signals to the ESD control valve 104 in response to the first cutoff signal. In some embodiments, if the ESD has already sent the second control signal to the ESD control valve 104 based on the first cutoff signal, the ESD will no longer send repeated second control signals to the ESD control valve 104 if the pressure measured by the first pressure gauge 102 is greater than a second pressure threshold.

[0065] In another possible implementation, the gas pipeline protection device includes a first safety shut-off valve 101 , a first pressure gauge 102 , an ESD, an ESD control valve 104 , and a second safety shut-off valve 105 .

[0066] Among them, the second safety shut-off valve 105 is installed in the upstream part of the gas transmission pipeline. The installation position of the second safety shut-off valve 105 is located between the installation position of the first safety shut-off valve 101 and the installation position of the ESD control valve 104. This application does not limit the specific installation position of the second safety shut-off valve 105. For example, the distance between the installation position of the second safety shut-off valve 105 and the installation position of the first safety shut-off valve 101 is 20 cm or 30 cm.

[0067] Second safety shutoff valve 105 is a self-operated safety shutoff valve that automatically operates based on the pressure of the gas flowing through it. It is designed to shut off gas from the gas pipeline when the pressure of the gas flowing through it exceeds a third pressure threshold. It remains open, allowing gas to continue flowing downward, when the pressure of the gas flowing through it is less than or equal to the third pressure threshold.

[0068] The third pressure threshold is less than the maximum pressure of the downstream portion. The third pressure threshold can be flexibly configured based on the maximum pressure of the downstream portion of the gas pipeline. Optionally, the third pressure threshold can be configured to a value slightly less than the maximum pressure of the downstream portion. For example, if the maximum pressure of the downstream portion is 10 MPa, the third pressure threshold can be configured to any value slightly less than 10 MPa, such as 9.4 MPa, 9.5 MPa, or 9.6 MPa.

[0069] Optionally, the second safety shut-off valve 105 is connected to the ESD, and the second safety shut-off valve 105 is also used to send a second shut-off signal to the ESD when the pressure of the gas flowing through the second safety shut-off valve 105 is greater than a third pressure threshold; the ESD is also used to send a second control signal to the ESD control valve 104 when it receives the second shut-off signal; and then the ESD control valve 104 cuts off the gas transported by the gas pipeline in response to the second control signal.

[0070] The above-mentioned gas pipeline protection device provides dual protection for the downstream portion of the gas pipeline by setting up two safety shut-off valves. Even if one of the safety shut-off valves fails, the other safety shut-off valve can be used to ensure the safe operation of the downstream portion of the gas pipeline, further improving the safety of the downstream portion of the gas pipeline.

[0071] Optionally, the third pressure threshold is smaller than the first pressure threshold. For example, the third pressure threshold differs from the first pressure threshold by 0.2 MPa. Since the second safety shut-off valve 105 is closer to the downstream portion with a lower maximum pressure, by setting the third pressure threshold corresponding to the second safety shut-off valve 105 to a smaller value, the second safety shut-off valve 105 can cut off the gas transported by the gas pipeline when the pressure of the gas flowing through it is greater than the smaller pressure threshold, thereby allowing the gas with lower pressure to be transported to the downstream portion of the gas pipeline, thereby minimizing the possibility of the downstream portion of the gas pipeline being ruptured due to overpressure, and further improving the safety of the downstream portion of the gas pipeline.

[0072] The first pressure gauge 102 can remotely transmit the measured pressure to other devices. For example, the first pressure gauge 102 transmits the measured pressure to a remote control device, allowing the remote control device to display the pressure, facilitating remote pressure monitoring by personnel and enabling timely control in the event of abnormal pressure fluctuations. Optionally, the gas pipeline protection device also includes a local pressure gauge, which is configured to display the pressure of the gas flowing through it, allowing personnel to check the gas pressure locally. For example, the gas pipeline protection device includes a first local pressure gauge 106 and a second local pressure gauge 107.

[0073] Optionally, the above gas transmission pipeline protection device is installed in the gas transmission station yard, which is the site where the gas transmission pipeline protection device and the gas transmission pipeline on which the gas transmission pipeline protection device is installed are located. Optionally, there are two gas transmission pipelines in the gas transmission station yard, one of which is used to transport gas, and the other is used as a standby gas transmission pipeline. The gas is transported to one of the two gas transmission pipelines through the first gas collecting pipe 108 upstream, and then continues to be transported to the gas transmission pipeline downstream of the second gas collecting pipe 109 through the second gas collecting pipe 109 downstream. Among them, the variable pressure point 103 is located on the gas transmission pipeline downstream of the second gas collecting pipe 109, and the first pressure gauge 102 and the ESD control valve 104 are located between the position where the second gas collecting pipe 109 is located and the variable pressure point 103. In addition, the first safety cut-off valve 101, the second safety cut-off valve 105, the first local pressure gauge 106 and the second local pressure gauge 107 in the gas transmission pipeline protection device are installed on both gas transmission pipelines.

[0074] Optionally, a second pressure gauge 110 is also installed on the gas transmission pipeline between the first gas collecting pipe 108 and the second gas collecting pipe 109. Optionally, the second pressure gauge 110 is located downstream of the second safety cut-off valve 105 and near the second safety cut-off valve, and is used to measure the gas pressure after flowing through the safety cut-off valve. Optionally, the second pressure gauge 110 can remotely transmit the measured pressure to other devices.

[0075] Optionally, the gas transmission pipeline protection device further includes an electric valve, which is used to control the opening and closing of the two gas transmission pipelines according to an electric signal. The gas transmission pipeline with the electric valve opened is used to transport gas, and the gas transmission pipeline with the electric valve closed is used as a standby gas transmission pipeline. Optionally, two electric valves are installed on each gas transmission pipeline. For example, a first electric valve 111 and a second electric valve 112 are installed on one gas transmission pipeline. The first electric valve 111 is installed between the position where the first gas collecting pipe 108 is located and the installation position of the upstream safety cut-off valve, and the second electric valve 112 is installed between the installation position of the downstream safety cut-off valve and the position where the second gas collecting pipe 109 is located. Optionally, other measuring instruments and other functional valves are also installed on the gas transmission pipeline, which are not limited in this application.

[0076] Optionally, the staff can remotely control the opening of an electric valve in one of the two gas transmission pipelines by performing an interactive operation on the control terminal; based on the staff's interactive operation, the control terminal controls the opening of the electric valve by sending an electrical signal to the electric valve indicated to be opened by the interactive operation. For example, based on the staff's interactive operation, the control terminal sends an opening message to the server, and the opening message is used to indicate the opening of the electric valve indicated to be opened by the interactive operation; in response to the opening instruction, the server sends an opening instruction to the control device to which the electric valve belongs; based on the opening instruction, the control device to which the electric valve belongs sends an electrical signal to the electric valve to control the opening of the electric valve.

[0077] Optionally, the electric valves of the two gas transmission pipelines are also connected to the ESD. When the safety shut-off valve and the ESD control valve 104 are both closed, and the pressure measured by the first pressure gauge 102 is greater than the second pressure threshold and continues to rise, the ESD sends a closing electrical signal to the electric valve in the open state to control the closing of the electric valve in the open state, so as to ensure the safe operation of the gas transmission pipeline by controlling the electric valve and further improve the safety of the gas transmission pipeline.

[0078] In another possible implementation, the gas transmission pipeline protection device includes a first safety shut-off valve 101, a first pressure gauge 102, an ESD, and a third safety shut-off valve.

[0079] Among them, the third safety shut-off valve is installed in the upstream part of the gas transmission pipeline, and the installation position of the third safety shut-off valve is between the installation position of the first safety shut-off valve 101 and the pressure change point 103. The specific installation position of the third safety shut-off valve in this application is not limited. For example, the distance between the installation position of the third safety shut-off valve and the installation position of the first safety shut-off valve 101 is 20 cm or 30 cm, etc.

[0080] The third safety shut-off valve is a self-acting safety shut-off valve that can automatically operate according to the pressure of the gas flowing through the third safety shut-off valve. The third safety shut-off valve is used to cut off the gas transported by the gas transmission pipeline when the pressure of the gas flowing through the third safety shut-off valve is greater than the fourth pressure threshold; when the pressure flowing through the third safety shut-off valve is less than or equal to the fourth pressure threshold, the valve remains open to allow the gas to continue to be transported downward.

[0081] Among them, the fourth pressure threshold is less than the maximum bearing pressure of the downstream part. The fourth pressure threshold can be flexibly configured according to the maximum bearing pressure of the downstream part of the gas transmission pipeline. Optionally, the fourth pressure threshold is configured as a value slightly less than the maximum bearing pressure of the downstream part. For example, if the maximum bearing pressure of the downstream part is 10 MPa, the fourth pressure threshold can be configured as any value slightly less than 10 MPa, such as 9.4 MPa, 9.5 MPa, or 9.6 MPa, etc.

[0082] Optionally, the third safety shut-off valve is connected to the ESD, and the ESD is further configured to send a third control signal to the third safety shut-off valve when the pressure measured by the first pressure gauge 102 is greater than the second pressure threshold; the third safety shut-off valve is further configured to cut off the gas transported by the gas pipeline in response to the third control signal.

[0083] The above gas pipeline protection device provides double protection for the downstream part of the gas pipeline by setting two safety shut-off valves. Even if one of the safety shut-off valves fails, the other safety shut-off valve can ensure the safe operation of the downstream part of the gas pipeline, further improving the safety of the downstream part of the gas pipeline.

[0084] Optionally, the fourth pressure threshold is less than the first pressure threshold. For example, the fourth pressure threshold differs from the first pressure threshold by 0.2 MPa. Since the third safety shut-off valve is closer to the downstream part with a lower maximum bearing pressure, by setting the fourth pressure threshold corresponding to the third safety shut-off valve to a smaller value, the third safety shut-off valve can cut off the gas transported by the gas pipeline when the pressure of the flowing gas is greater than the smaller pressure threshold, so that the gas with a smaller pressure is transported to the downstream part of the gas pipeline, and as much as possible prevent the downstream part of the gas pipeline from bursting due to overpressure, further improving the safety of the downstream part of the gas pipeline.

[0085] In another possible implementation, the above safety shut-off valve can also be replaced by a pressure regulating valve. For example, the first safety shut-off valve 101 is replaced by a pressure regulating valve. The pressure regulating valve does not adjust the opening of the valve when the pressure of the gas flowing through the pressure regulating valve is equal to the first pressure threshold; the pressure regulating valve reduces the opening of the valve when the pressure of the gas flowing through the pressure regulating valve is greater than the first pressure threshold, so as to reduce the pressure of the gas flowing to the downstream part; the pressure regulating valve increases the opening of the valve when the pressure of the gas flowing through the pressure regulating valve is less than the first pressure threshold, so as to increase the pressure of the gas flowing to the downstream part, and keep the pressure of the gas flowing to the downstream part constant.

[0086] In another possible implementation, the gas pipeline protection device further includes a pressure regulating valve, and the installation position of the pressure regulating valve is upstream of any of the above safety shut-off valves. Optionally, the distance between the installation position of the pressure regulating valve and the installation position of the safety shut-off valve is less than a fourth distance threshold, and the fourth distance threshold can be flexibly configured. For example, the fourth distance threshold is configured as 30 cm, 50 cm, or 1 m, etc., and the present application does not limit this. When the pressure of the gas flowing through the pressure regulating valve is greater than the pressure threshold corresponding to the pressure regulating valve, the pressure regulating valve reduces the valve opening to reduce the pressure of the gas flowing to the downstream part. The safety shut-off valve located downstream of the pressure regulating valve can cut off the transported gas when the pressure of the gas flowing through the pressure regulating valve is still greater than the pressure threshold corresponding to the safety shut-off valve, so as to still be able to effectively protect the downstream part of the gas pipeline in the case of pressure regulating failure of the pressure regulating valve. Optionally, the pressure threshold corresponding to the pressure regulating valve is equal to the pressure threshold corresponding to the safety shut-off valve located downstream of the pressure regulating valve and closest to the installation position of the pressure regulating valve; or, the pressure threshold corresponding to the pressure regulating valve is slightly less than the pressure threshold corresponding to the safety shut-off valve located downstream of the pressure regulating valve and closest to the installation position of the pressure regulating valve, and the present application does not limit this. For example, the pressure threshold corresponding to the safety shut-off valve located downstream of the pressure regulating valve and closest to the installation position of the pressure regulating valve is 9.8 MPa, and the pressure threshold corresponding to the pressure regulating valve is 9.8 MPa or 9.7 MPa.

[0087] In another possible implementation, the installation position of the first pressure gauge 102 is downstream of the variable pressure point and near the starting position of the downstream part of the gas pipeline, and is used to measure the gas pressure near the starting position of the downstream part. Among them, the starting position of the downstream part is the variable pressure point. By making the distance between the installation position of the first pressure gauge 102 and the variable pressure point less than a fifth distance threshold, the first pressure gauge 102 can measure the gas pressure near the starting position of the downstream part and upload it to the ESD, so that the ESD can timely control the first safety shut-off valve 101 or the ESD control valve to cut off the gas transported by the gas pipeline when the gas pressure in the downstream part is greater than the second pressure threshold, preventing the overpressure gas from continuing to be transported to the downstream part of the gas pipeline, ensuring the safe operation of the downstream part of the gas pipeline, and improving the safety of the gas pipeline. Among them, the fifth distance threshold can be flexibly configured. For example, the fifth distance threshold is configured as 1 m, 50 cm, or 30 cm, etc., and the present application does not limit this.

[0088] All of the above optional technical solutions can be combined arbitrarily to form optional embodiments of the present application, which will not be elaborated one by one here.

[0089] Optionally, the ESD is configured as a computer device. Figure 22 is a block diagram of a computer device provided in an embodiment of the present application. Computer device 200 may vary significantly depending on configuration or performance, and may include one or more processors (CPUs) 201 and one or more memories 202. Memory 202 stores at least one program code, which is loaded and executed by processor 201 to implement the aforementioned ESD functionality. Of course, the computer device may also include components such as a wired or wireless network interface, a keyboard, and input / output interfaces for input and output. The computer device may also include other components for implementing device functionality, which are not detailed here.

[0090] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A gas transmission pipeline protection device, characterized in that, The gas pipeline protection device is applied to a gas pipeline, wherein the maximum pressure of the upstream portion of the gas pipeline is greater than the maximum pressure of the downstream portion of the gas pipeline, the upstream portion and the downstream portion are divided by a pressure change point, and the gas in the gas pipeline is transported from the upstream portion to the downstream portion; The gas pipeline protection device includes a first safety shut-off valve, a first pressure gauge, an emergency shutdown system ESD, an ESD control valve, and a second safety shut-off valve; The first safety shut-off valve and the first pressure gauge are both installed in the upstream portion of the gas pipeline, the first pressure gauge is installed between the first safety shut-off valve and the pressure change point, and the first safety shut-off valve and the first pressure gauge are respectively connected to the ESD; The installation position of the ESD control valve is upstream of the pressure change point and near the pressure change point, and the installation position of the second safety cut-off valve is between the installation position of the first safety cut-off valve and the installation position of the ESD control valve; the ESD control valve and the second safety cut-off valve are both connected to the ESD; The first safety shut-off valve is used to shut off the gas transported by the gas pipeline under the condition that the pressure of the gas flowing through the first safety shut-off valve is greater than a first pressure threshold, and the first pressure threshold is less than the maximum pressure of the downstream portion; The first pressure gauge is used to upload the measured gas pressure to the ESD; The ESD is configured to send a first control signal to the first safety shut-off valve under the condition that the pressure measured by the first pressure gauge is greater than a second pressure threshold, the second pressure threshold is less than the maximum pressure of the downstream portion, and the second pressure threshold is greater than the first pressure threshold; The first safety cut-off valve is further configured to cut off the gas transported by the gas pipeline in response to the first control signal; The second safety shut-off valve is configured to shut off the gas transported by the gas pipeline and send a second shut-off signal to the ESD when the pressure of the gas flowing through the second safety shut-off valve is greater than a third pressure threshold; The ESD is further configured to send a second control signal to the ESD control valve upon receiving the second cutoff signal; The ESD control valve is used to cut off the gas transported by the gas pipeline in response to the second control signal.

2. The gas pipeline protection device according to claim 1, characterized in that, The ESD is further configured to send the second control signal to the ESD control valve under the condition that the pressure measured by the first pressure gauge is greater than a second pressure threshold.

3. The gas pipeline protection device according to claim 1, characterized in that, The distance between the installation position of the ESD control valve and the pressure change point is less than a first distance threshold.

4. The gas pipeline protection device according to claim 1, characterized in that: The first safety shut-off valve is further configured to send a first shut-off signal to the ESD when the pressure of the gas flowing through the first safety shut-off valve is greater than the first pressure threshold; The ESD is further configured to send the second control signal to the ESD control valve in response to the first cutoff signal.

5. The gas pipeline protection device according to claim 1, characterized in that, The third pressure threshold is lower than the maximum pressure tolerance of the downstream portion.

6. The gas pipeline protection device according to claim 1, characterized in that: The third pressure threshold is lower than the first pressure threshold.

7. The gas pipeline protection device according to claim 1, characterized in that: The gas pipeline protection device further includes a third safety shut-off valve; The third safety cut-off valve is installed at the upstream portion of the gas pipeline, and the installation position of the third safety cut-off valve is located between the installation position of the first safety cut-off valve and the pressure change point; The third safety shut-off valve is used to cut off the gas transported by the gas pipeline when the pressure of the gas flowing through the third safety shut-off valve is greater than a fourth pressure threshold, and the fourth pressure threshold is less than the maximum pressure of the downstream part.

8. The gas transmission pipeline protection device according to claim 7, characterized in that, The third safety shut-off valve is connected to the ESD; The ESD is further configured to send a third control signal to the third safety shut-off valve under the condition that the pressure measured by the first pressure gauge is greater than the second pressure threshold; The third safety shut-off valve is further configured to shut off the gas transported by the gas pipeline in response to the third control signal.

9. The gas pipeline protection device according to any one of claims 1 to 8, characterized in that: The distance between the installation position of the first safety cut-off valve and the pressure change point is less than a second distance threshold.

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